Mithrandir Metrics
Player Seattle Mariners Refreshed Jun 1 06:00 AM ET
Player profile / Seattle Mariners

Luis Castillo

P profile with live context, projection links, and Mithrandir card history when available.

Cards
16
Modules
1
Live Δ
yes
Club Seattle Mariners Position P Roster Active Status Healthy / active roster
Rolling projection

Preseason / current pace / Bayesian update

Rolling bands shrink current-season signal toward the preseason prior until the sample earns more weight.

2026-06-01
ERA preseason3.85
ERA current pace5.90
ERA rolling p504.97
Observed weight55%
ERA
3.95 4.43 4.97 5.50 5.98
FIP
3.50 3.80 4.14 4.48 4.78
K%
18.6% 20.0% 21.6% 23.2% 24.6%
BB%
5.9% 6.6% 7.4% 8.2% 8.9%
Live percentile strip

Current traits vs projection tick

100th = best in MLB.

2026-06-01
Pitching · percentile strip
BB%8.3%
58 -18 vs proj
Barrel allowed10.8%
17 -22 vs proj
Fastball velo95.1
65
Hard-hit allowed50.0%
3
K%21.5%
43
Whiff%22.6%
46
xwOBA allowed0.351
17 -25 vs proj
Mithrandir+

Stuff+ and arsenal context

Stuff+ appears when the current pitch-event scoring artifact includes this pitcher; missing coverage is shown explicitly.

2026-06-01
Mithrandir Stuff+104
63
Rolling form chart

xwOBA allowed snapshot line

Live snapshot series; true 50/100 PA windows require PA-level logs

12 snapshots
Mithrandir Metrics ROLLING XWOBA LINE Parameterized Mithrandir chart rendered as SVG for templates and exports. season=2026 Rolling xwOBA allowed Castillo, Luis · Live snapshot series; true 50/100 PA windows require PA-level logs LG AVG 0.314 2026-05-17: 0.3732026-05-19: 0.3732026-05-21: 0.3662026-05-23: 0.3662026-05-24: 0.3662026-05-25: 0.3662026-05-26: 0.3562026-05-28: 0.3562026-05-29: 0.3562026-05-30: 0.3562026-05-31: 0.3562026-06-01: 0.351 2026-05-17 2026-06-01 xwOBA allowed MITHRANDIR · CHARTS
Optimization map

Arsenal optimization map

Pitch-shape context from this pitcher’s current arsenal snapshot. Hover a pitch to inspect usage, movement, and bat-missing context.

6Pitches 2026Season 44%Top usage
ride armside gloveside +Arsenal gap +Shape contrast
Zone profile

Aggregate zone heatmap

Aggregate zone metrics from seasonal Statcast leaderboards.

Mithrandir Metrics ZONE HEATMAP Parameterized Mithrandir chart rendered as SVG for templates and exports. season=2026 Pitch Zone Profile Castillo, Luis · Aggregate zone metrics; not pitch-by-pitch locations Edge: 40%40%Zone: 48%48%Whiff: 23%23%Called strike: 13%13%First pitch strike: 56%56%Hard hit allowed: 50%50% Dashed border = aggregate mixed-batter zone proxy MITHRANDIR · CHARTS
Pitch arsenal

Usage mix, movement map, and Stuff+ composition

2026 pitch-level arsenal aggregates; current season takes over after 100 tracked pitches across at least 2 pitch types. Descriptive pitch-type Stuff+ composition. Not a promoted predictive metric.

2026
Mithrandir Metrics PITCH ARSENAL DONUT Parameterized Mithrandir chart rendered as SVG for templates and exports. Pitch Arsenal Castillo, Luis · 2026 arsenal snapshot 4-Seam Fastball: 43.8%Slider: 25.3%Sinker: 18.4%Changeup: 11.9%Cutter: 0.5%Pitch Out: 0.1% MIX FF 44%SL 25%SI 18%CH 12%FC 1%PO 0% MITHRANDIR · CHARTS
Mithrandir Metrics PITCH MOVEMENT Parameterized Mithrandir chart rendered as SVG for templates and exports. Pitch Arsenal Castillo, Luis · 2026 arsenal snapshot FF: HB -0.1, IVB 1.4FFSL: HB -0.0, IVB 3.0SLSI: HB 0.9, IVB 2.1SICH: HB -0.6, IVB 3.0CHFC: HB -0.1, IVB 2.0FCPO: HB -1.0, IVB 1.7PO horizontal break IVB MITHRANDIR · CHARTS
PitchUsagePitchesStuff+Status
FB 44.8% 464 101 qualified
SL 25.9% 268 104 qualified
SI 17.5% 181 105 limited sample
CH 11.7% 121 106 limited sample
FC 0.1% 1 111 limited sample
Method note

Renamed from the attempted Kirby Index after audit; true Kirby requires release-angle trajectory data.

Reference layer

Current snapshot

Age33
Height6' 2"
Weight200 lb
Debut2017-06-23
Live layer

Delta / regression

ERA Δ+1.97
K% Δ+0.008

positive regression

Mithrandir coverage

Module shelf

ModuleCardsLatestSignal
Pitching162026-05-254-Seam Fastball played up through SL/SI tunnel quality
Projection links / recent games

Available detail

Pitcher Projections 202620.7% K | 3.93 ERAProjection
2026-04-11 vs HOU7 ER / 3 K3.1 IP
2026-04-05 @ LAA3 ER / 4 K3.2 IP
2026-03-30 vs NYY0 ER / 7 K6.0 IP